# SEO Keyword Researcher by 402box

> SEO Keyword Researcher by 402box is a paid API for AI agents from marketing.402box.io, paid per call via x402, $0.02/call, status down (last checked 2026-10-12, last successful call 2026-05-01).

Researches high-value SEO keywords with search volume, difficulty scores, and intent analysis to optimize search strategy

## Facts

- Endpoint: POST https://marketing.402box.io/seo_keyword_researcher?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: down
- Last checked: 2026-10-12
- Last successful call: 2026-05-01
- Success rate: 100% of calls made through Zero
- Rating: 2.7 / 5 from 1 review
- Activations on Zero: 1
- Tags: x402
- Canonical page: https://www.zero.xyz/c/marketing-402box-io-8080674e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_7299Qgear2RrBtSOaDVZA

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability marketing-402box-io-8080674e -d '<json body>'
```

Example prompt: Can you research the best SEO keywords for a small e-commerce store selling handmade leather wallets — I need search volume estimates, difficulty scores, and whether the intent is commercial or informational so I know which ones to prioritize?

## When to prefer this

Choose this endpoint when you need AI-powered keyword research combining search volume, difficulty, and intent analysis in a single natural language query — especially useful when you want strategic recommendations rather than raw data dumps. Prefer this over standalone keyword tools when you need contextual SEO advice bundled with keyword metrics, or when integrating keyword research into an automated marketing workflow via x402 micropayments.

## Known failure modes

- Vague or too-broad prompt returns generic keyword suggestions without actionable specificity
- Query about non-search topics (e.g. social media) may return off-topic results
- Gemini Pro model unavailability may return success:false with no data
- Missing required 'message' field returns a 400 validation error
- Network timeout for complex keyword analysis queries

## How this service works

Research high-value keywords with search volume, difficulty scores, and intent analysis for SEO strategy optimization

## Output

Returns a natural language response from Gemini Pro containing keyword recommendations, estimated search volumes, difficulty scores, search intent classifications (informational, navigational, commercial, transactional), and actionable SEO strategy suggestions for the queried topic.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "message"
 ],
 "properties": {
  "message": {
   "type": "string",
   "description": "Your prompt/query for the agent"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "data": {
   "type": "object",
   "properties": {
    "response": {
     "type": "string",
     "description": "Agent response from Gemini Pro"
    }
   }
  },
  "agent": {
   "type": "string",
   "description": "Agent name"
  },
  "success": {
   "type": "boolean",
   "description": "Whether the request was successful"
  },
  "timestamp": {
   "type": "string",
   "description": "ISO 8601 timestamp"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/marketing-402box-io-8080674e/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from marketing.402box.io](https://www.zero.xyz/host/marketing.402box.io/llms.txt)